Skip to main content

Do you need BDD style of system tests ?

BDD was largely introduced as a bridge between domain experts who are usually not technical users and Engineers who are supposedly no domain experts. BDD gives an ability to domain experts to describe application feature in Given, When, Then style and these are then turned in to real application feature by Engineers. All stakeholders have common reference of understanding.
But it does not stop there, there was great value (and probably there is ) seen in writing system tests which follow BDD style. JBehave, Cucumber-JVM come on mind quickly. These APIs also help bridge the gap between technical and not technical user, but the questions we need to ask is -
  • Would you be able to get product specialist write the feature files? If not then you would have two sources of information one written by product specialist (probably in JIRA or another tool) and another feature file written by developer or test engineer
  • Will product specialists ever execute the test?
  • Do you want to introduce an extra layer of steps when you might be the only one working and verifying the tests?
BDD Scenario from Dan North  - 
+Scenario 1: Account is in credit+
Given the account is in credit
And the card is valid
And the dispenser contains cash
When the customer requests cash
Then ensure the account is debited
And ensure cash is dispensed
And ensure the card is returned

Modification from James Basch -
+Scenario 1: Account is in credit+
Given the account is in credit
And the card is valid
And the dispenser contains cash
When the customer requests cash
Then check that the account is debited
And check that cash is dispensed
And check that the card is returned
And check that nothing happens that should n’t happen and everything else happens that should happen for all variations of this scenario and all possible states of the ATM and all possible states of the customer’s account and all possible states of the rest of the database and all possible states of the system as a whole, and anything happening in the cloud that should not matter but might matter.
Source
  • Are you ready to deal with the complexity of information flow when you have to maintain the state from step to step ?
And how do you solve the communication problem if you don't use cucumber? Talk to your stack holders, no amount tools can replace face to face communication. BDD is no guarantee of not doing things wrong and decision is yours.
When I was writing cucumber tests then they became source of truth for manual testing team to assume application works well and in case test fail I would have to fix them. I am not sure if cucumber solves any problem when used in this manner.

Comments

Popular posts from this blog

Distributed Load Testing with JMeter

Distributed Testing with JMeter When one JMeter client is not able to offer amount of threads required for load testing then distributed testing is used. In distributed testing - One instance of JMeter client can control number of JMeter instances and collect data from them Test plan does not need to be copied to each server, the client sends it to all servers note - JMeter will run all the threads on all the servers, hence 100 threads on 5 JMeter server would pump 500 threads in total. If many server instances are used, the client JMeter can become overloaded and so the client network connection. This has been improved in latest versions of JMeter by switching to Stripped modes, but you should always check that your client is not overloaded When Client (master) and Server (slave) nodes are on same network (no SSH required) Configure Client Node Herein client is referred as the machine controlling test execution on other JMeter nodes. This is also referred

Using chrome console to test xPath and css selectors

Since the advent of selenium there have been many plugin to test xPath / css selectors but you don’t need any of them if you have chrome browser. Using Chrome console you can test both xPath and css selectors. Launch website to be tested in chrome browser and hit F-12 and you would see chrome console opened in lower pane of application - Hit escape key and console would open another pane to write element locators - And now you can start writing xPath or css selectors in chrome console and test them - The syntax for writing css id - $$(“ ”) And hit the enter key. If your expression is right then html snippet of the application element corresponding to the css selector would be displayed - If you mouse over the html snippet in chrome console then it would highlight the corresponding element in application - If you want to clean console of previously written element selectors then just hit ctrl+L keys and chrome console would be empty again. Pro

XPath and single quotes

I had tough time dealing with XPath and single quote. Though W3C recommends using ' to escape it but I never got it working, let me know if any of you get through. Came across this blog and found that “concat” could be used in this situation. So original XPath expression is – //meta[@name=’DESCRIPTION’][@content=’Tester’s Test’] This is some thing which certainly fails as single quote in “Tester’s” marks it at end of string and then XPath blows up, next trial was – //meta[@name=’DESCRIPTION’][@content=’Tester''s Test’] This does not work despite w3c recommendation! And then I used concat function and split the string as – concat(‘Tester’,”’”,’s Test’) NOTICE that single quote is kept in double quote while other characters are kept in single quotes. So XPath looks as – //meta[@name=’DESCRIPTION’][@content=concat(‘Tester’,”’”,’s Test’)] And this works charm.